function [ ts1, ts2 ] = get_amiga_filter_ts( amiga_model, audio_filter_mode )

if ~strcmpi(amiga_model, '')
    [C1, R1, C2, R2, C3 ,R3] = get_amiga_filter_params(amiga_model);
end

if strcmpi(audio_filter_mode, 'led filter off') || strcmpi(audio_filter_mode, 'unfiltered')
    ts2 = tf(1, 1);
elseif strcmpi(audio_filter_mode, 'led filter on')
    ts2 = tf(1, [R2*R3*C3*C2 C3*(R2+R3) 1]);
else
    error('unknown filter_mode');
end

if strcmpi(audio_filter_mode, 'unfiltered')
    ts1 = tf(1, 1);
else
    ts1 = tf(1, [R1*C1 1]);
end

end